A constitutive model for sheared dense fiber suspensions
نویسندگان
چکیده
We propose a constitutive model to predict the viscosity of fiber suspensions, which undergoes shear thinning, at various volume fractions, aspect ratios, and stresses/rates. calibrate using data from direct numerical simulation prove accuracy by predicting experimental measurements literature. use friction coefficient decreasing with normal load between fibers quantitatively reproduce experimentally observed thinning in suspensions. In this model, effective contact force, is directly proportional bulk stress, determines coefficient. A rise stress reduces suspension. As result, jamming fraction increases resulting suspension viscosity. Moreover, we extend quantify effects ratio simulations for rate-controlled flow. Once calibrated, show that can be used relative different stresses, ratios. The predictions are excellent agreement available findings study potentially tune size designing rheology applications.
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ژورنال
عنوان ژورنال: Physics of Fluids
سال: 2023
ISSN: ['1527-2435', '1089-7666', '1070-6631']
DOI: https://doi.org/10.1063/5.0134728